A tank can be filled by two pipes. Pipe A can fill the tank in 6 hours, and Pipe B can fill it in 9 hours. If both pipes are opened simultaneously, how long will it take to fill the tank completely?

Sun, 03 May 2026 21:53:12 +0000

A tank can be filled by two pipes. Pipe A fills the tank in 6 hours, and Pipe B in 9 hours. If both are opened at the same time, how long does it truly take to fill the tank completely? This question reflects growing interest in practical problem-solving and resource efficiency—common themes among curious U.S. audiences navigating everyday maintenance, home improvement, or even business water system management. With increasing focus on sustainability and cost-saving, understanding how overlapping systems combine their efforts offers both clarity and reassurance. ### The Mechanics of Two-Stage Filling When two pipes fill the same tank simultaneously, their flow rates combine. Pipe A fills 1 tank every 6 hours, so its rate is approximately 0.1667 tanks per hour. Pipe B fills 1 tank every 9 hours, or about 0.1111 tanks per hour. Together, their combined rate is nearly 0.2778 tanks per hour. This surge in speed explains why users commonly wonder about shared efforts—efficiency through teamwork isn’t just a metaphor, it’s a measurable pattern.